Key button for a handset



FIG. 1 is a front perspective view of a key button for a handset showingmy new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a rear view thereof.

The broken line showing various regions of the handset is forillustrative purposes only and forms no part of the claimed design.

The ornamental design for a key button for a handset, as shown anddescribed.